On Sunday 7 October1571 the combined Christian fleets under Don John of Austria achieved a significant naval victory over the Turks in the Straits of Lepanto. Thousands of Christians were liberated, the Turkish fleet was destroyed, and they suffered their first great defeat at sea. In gratitude to God and Our Lady, PopeSaintPius V ordered an annual commemoration to be made of Our Lady of Victory. In 1573PopeGregory XIII transferred the feast to the first Sunday of October with the title Feast of the Most Holy Rosary since the victory was won through invocation of Our Lady of the Rosary. In 1716PopeClement XII extended the feast to the whole Latin Rite calendar, assigning it to the first Sunday in October. PopeSaintPius X changed the date to 7 October in 1913. In 1969PopePaul VI changed the name of the feast to Our Lady of the Rosary.